Pulsating device and method of honing



May 30, 1944.

J. E. KLINE PULSATING DEVICE AND METHOD OF HONING Fi1eqAug- 29. 1941 named Marzo, V1944 John E. Kline, Grosse Pointe Farms.

signor to Mlcromatic lione Corporation, troit, Mich., a oorporat Mich., as-

ion of Michigan Application Angnst 29, 1941, Serial No. 408,711

3 Claims.

My invention relates to honing machines and methods and particularly to a device and method for modifying the reciprocating cycle of a honing tool during a honing operation.

It has been the' practice in the art to reciprocate the honing tool within a cylinder to be machined with a stroke equal substantially to the full length of the cylinder, and superimpose upon said stroke a vibratory movement for the purpose of materially breaking up the scratch marks on the cylinder wall. The superimposed vibration, or reciprocation, on the stroking reciprocating movement produces faster cutting as well as a finer finish on the cylinder surface. Mechanical means were employed for superimposing the oscillation or short stroke reciprocation to the honing tool, and I iind that I can not only accomplish the same result by manipulating the flow of the fluid during the reciprocating cycle, but can actually reverse vthe movement of the tool relative to the surface as the tool is advanced thereacross.

I connect a cylinder in the pressure circuit and drive the piston thereof in reciprocation for alternatingly aiecting the volume of fluid delivered to the cylinder that reciprocates the honing tools. In this manner, the natural cycle of reciprocation is retarded and accelerated a number oi times during each normal stroking movement. On the suction stroke of the piston, the deliveredvolume is reduced so that the stroking cylinder for the tool is retarded and preferably reversed. On the compression stroke of this piston, the delivered volume is increased, which accelerates the stroking cylinder for the hone, above its normal speed of movement. This action simulates the action of superimposing' a reciprocating movement on the vstroking movement of the tool and dillers therefrom in actually reversing the movement of the tool relative to the surface being honed as the tool is advanced across the surface.

Accordingly, the main objects of my invention are to accelerate and decelerate the movement in reciprocatlon of a honing tool by iluctuating the volume of iluid which reciprocates the tool; to accelerate and decelerate the movement of a honing .tool by cyclically the fluid system; to accelerate and decelerate the speed of movement of a reciprocating piston by pulsating the fluid in the system which reciprocates the piston; to connect a cylinder in a fluid pressure system and operate a piston therein in reciprocation to vary the delivery volume in thesystem and accelerate and reverse the varying the volume of l movement of a honing tool during its normal cycle of reciprocation; and, in general, to provide a method for cyclically changing the movement of a honing tool in reciprocation which is simple in construction and positive in operation.

Other objects and features of my invention will be specically pointed out or will become sides of the piston apparent when referring, for a better understanding of my invention, to the following description, taken in conjunction with the accompanying drawing, wherein:

Fig. l is a diagrammatical view of a system for operating a honing tool in rotation and reciprocation while practicing my invention;

Fig. 2 is a view of the pulsating cylinder shown in Fig. i, illustrating 'a modified form of operating mechanism therefor.

1 have illustrated one or a plurality of honing tools i0 of conventional form having a plurality of abrasive stones il, which are expansible by suitable means, such as a spring, a fluid or the like. In the tool illustrated, a spring is utilized as the expanding means, while cam fingers i2, operated by a cam plate I3, render the spring effective to expand the stones. The honing tool is supported on a shaft Il, which is driven in rotation by a plurality of gears l5 operated from a spline shaft It. The head I1 is mounted for reciprocation on slide bars IB when suspended from a piston rod i9, on which a piston 2i is mounted, within a cylinder 22. Conduits 23 and 24 are connected to opposite ends of the cylinder 22 and to opposite ends of a cylinder 3l. A tank 26 contains a uid 21, such as oil, which is circulated by a pump 28, through a conduit 32 to a four-way valve 25. The iluid is returned to the tank from the four-way valve 25 through a metering or speed regulating valve 30 and conduits 33 and 34. The pressure on the liquid delivered from the conduit 32 is controlled by the regulating valve 3l connected to a conduit 29 and to the return conduit 34.

A conduit 36 from the valve 25 is connected to the conduit 24 which is joined to the right hand end of the cylinder 31, as viewed in Fig. 1. A piston 38 operates in the cylinder 3l on a piston rod 39, which is reciprocated by a cam plate Il. The piston rod is the same diameter on both to move equal volume of liquid each time the piston is reciprocated. The crank is driven from a shaft l2 on which a flywheel 43 is mounted. A conduit III connects the opposite side of the valve 25 to the'front end of the cylinder 31, as viewed in the figure.

In operation, when the piston 2| yis moving 2| is moved downwardly, forcing valve 25,

valve has been moved to connect the uid in the pressure line 32 through the conduit 4| to system by conduits 53 and 6|, which controls the the fluid end of the cylinder 31. The rear end of the cylinder 31 is connected through the conduit 36 to the valve 25 and through the conduits 33 and 34 tothe tank. The flow of liquid to the tank, however, is controlled by the metering and speed regulating valve pressure on the lower end of the cylinder 22 and the rear end of the cylinder 31. As liquid is delivered through the conduit 32, the valve 25, conduit 40, through the cylinder 31,-conduit 23. into the upper end of the cylinder 22,.the piston the liquid the conduit 24 into the rear end of the 31 and through the conduit 3S, the

valve 30, conduits 33 and 34. to the through cylinder tank.

Duringthe flow of fluid in' this manner, the piston 38 in the cylinder-31 is rapidly reciprocated, providing a pulsation to theffluid on both sides of the piston 2|, which may retard, arrest, or reverse, while accelerating, lthe -downward movement of the piston, depending upon the relative sz'ze of the cylinders 31 and 22.

When the piston approaches the end of its downward movement, the ng'er 51 strikes the collar 56 on the rod 54 to reverse the pilot valve 4B, which operates the valve 25, to reverse the ow of fluid in the conduits 35 and 45|. The piston 2| is then moved upwardly and will be retarded, erated in the same manner, as pointed out hereinabove relative to the down stroke of the piston.

\ the cutting effect of the abrasive particles which produces faster abrasion and a ilne degree of nish to the cylinder wall.

A pilot control circuit 41 is connected between the pressure line 29 and a pilot valve 48. The pilot valve is connected by conduits 49 and 5| to one or the other of the four-way valve 25 and is operated by a rack 52 and pinion 53, mounted on a rod 54. Collars 55 and 56 are adjustable on the rod 54 to regulate the length of stroke of the piston 2|. The rod is moved at the end of each stroke by a nger 51 which projects between which produces a back arrested, or reversed, while`being accel-` 2,350,117 downwardly. from the position illustrated, the

the collars. A dwell valve 53 is connected in the time for additional stroking of the piston 2| and tool l0 after the abradin'g operation has been completed and a handle 62 of the valve has been operated to oi position.

In Fig. 2, I have illustrated a modified form of drive mechanism for the piston rod 39, wherein a roller 44 is attached to the end of the rod in contact with a cam 65 on the shaft 42, on which a ily wheel 43 is mounted. 'I'he pressure inthe system forces the piston 38 to the right, as viewed in the gure, thereby maintaining contact between the roller 44 and the cam 45, in all accompanying claims.

What is claimed is:

1; In a system for honing a cylinder, the combination including a. honing tool, a piston and cylinder which produces honing tool within a lworking stroke, a system for delivering uid to opposite sides of the cylinder, means for reversing said new of iiuid to said cylinder, and means for pulsating the flow 'of the fluid.

2. The combination in a honing machine, a honing tool, a cylinder having `a reciprocable piston, a fluid pressure system connected to each 'end o1' said cylinder, valve means for reversing the ow of the fluid to said cylinder, a pump for delivering uid to said system and a cylinder ed in the pressure system having a piston therein which alternately decreases and increases the volume of fluid supplied to the rst said cylinderwhen said last piston is reciprocated.

3. The combination in a honing machine, a honing tool, a cylinder and piston in said machine for operating said honing tool in reciproopposite ends of the cylinder, means for operating said valve for reciprocating said piston, a second cylinder connected in said uid system, a piston reciprocated in said cylinder at a higher the reciprocation of they` 

